The Wiz Kid Harness by Black Diamond is made for any kid that wants to get out and climb with Mom and Dad (made for top roping only). Designed to be a kid's version of the Momentum Speed, the Whiz Kid has one Speed Buckle for quick and safe adjustments, and comes in one size that fits kids from 35-110 pounds (16-50 kg).

At Sylvan Rocks Climbing School, we have tried nearly every brand of kids climbing harnesses. The Wiz kid is our favorite for the youngest climbers. The full body harnesses are great for the smallest and lightest kids, but this harness is great after that. We always have several Wiz kids at the ready for our daily courses with small or really skinny children.

That is what my kids exclaimed when they saw the Wiz. I bought the Wiz harness for my 6 y/o son and it fits my 4 y/o daughter too. It's a great way to get them introduced to the sport and to keep them enthused about the outdoors. The speed adjust buckles make it easy to adjust between my two kids.

Owning a BD Ozone harness, I buy this one for my 6 years old daughter and realy feel the same serious building! The speed adjustement of the leg and waist loop is great and easy when sharing the harness between kids. Seems to be very confortable.

I had originally purchased BD Momentum in XS as I read two reviewers say they used it on their children almost the same age as mine 5 and 7 y.o. However way too big for my kids. So I broke down and purchased these. Much better fit for my kids. Unlike the Momentum, these had adjustable leg straps. I have the BD Primrose which has a velcro under the waist strap. I would have liked to have seen that on the Wiz Kid Harness.